<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"
    />
    <meta name="description" content="Use HeadingPitchRoll" />
    <meta name="cesium-sandcastle-labels" content="Tutorials" />
    <title>Cesium Demo</title>
    <script type="text/javascript" src="../Sandcastle-header.js"></script>
    <script
      type="text/javascript"
      src="../../../Build/CesiumUnminified/Cesium.js"
      nomodule
    ></script>
    <script type="module" src="../load-cesium-es6.js"></script>
  </head>
  <body
    class="sandcastle-loading"
    data-sandcastle-bucket="bucket-requirejs.html"
  >
    <style>
      @import url(../templates/bucket.css);
    </style>
    <div id="cesiumContainer" class="fullSize"></div>
    <div id="loadingOverlay">
      <h1>Loading...</h1>
    </div>
    <div id="toolbar">
      <table class="infoPanel">
        <tbody>
          <tr>
            <td>
              Click on the 3D window then use the keyboard to change settings.
            </td>
          </tr>
          <tr>
            <td>Heading: <span id="heading"></span>°</td>
          </tr>
          <tr>
            <td>← to left/→ to right</td>
          </tr>
          <tr>
            <td>Pitch: <span id="pitch"></span>°</td>
          </tr>
          <tr>
            <td>↑ to up/↓ to down</td>
          </tr>
          <tr>
            <td>roll: <span id="roll"></span>°</td>
          </tr>
          <tr>
            <td>← + ⇧ left/→ + ⇧ right</td>
          </tr>
          <tr>
            <td>Speed: <span id="speed"></span>m/s</td>
          </tr>
          <tr>
            <td>↑ + ⇧ to speed up/↓ + ⇧ to speed down</td>
          </tr>
          <tr>
            <td>
              following aircraft
              <input id="fromBehind" type="checkbox" />
            </td>
          </tr>
        </tbody>
      </table>
    </div>
    <script id="cesium_sandcastle_script">
      function startup(Cesium) {
        "use strict";
        //Sandcastle_Begin
        const viewer = new Cesium.Viewer("cesiumContainer", {
          shouldAnimate: true,
        });

        const canvas = viewer.canvas;
        canvas.setAttribute("tabindex", "0"); // needed to put focus on the canvas
        canvas.addEventListener("click", function () {
          canvas.focus();
        });
        canvas.focus();

        const scene = viewer.scene;

        const pathPosition = new Cesium.SampledPositionProperty();
        const entityPath = viewer.entities.add({
          position: pathPosition,
          name: "path",
          path: {
            show: true,
            leadTime: 0,
            trailTime: 60,
            width: 10,
            resolution: 1,
            material: new Cesium.PolylineGlowMaterialProperty({
              glowPower: 0.3,
              taperPower: 0.3,
              color: Cesium.Color.PALEGOLDENROD,
            }),
          },
        });

        const camera = viewer.camera;
        const controller = scene.screenSpaceCameraController;
        let r = 0;
        const center = new Cesium.Cartesian3();

        const hpRoll = new Cesium.HeadingPitchRoll();
        const hpRange = new Cesium.HeadingPitchRange();
        let speed = 10;
        const deltaRadians = Cesium.Math.toRadians(3.0);

        let position = Cesium.Cartesian3.fromDegrees(
          -123.0744619,
          44.0503706,
          5000.0
        );
        let speedVector = new Cesium.Cartesian3();
        const fixedFrameTransform = Cesium.Transforms.localFrameToFixedFrameGenerator(
          "north",
          "west"
        );

        const planePrimitive = scene.primitives.add(
          Cesium.Model.fromGltf({
            url: "../../SampleData/models/CesiumAir/Cesium_Air.glb",
            modelMatrix: Cesium.Transforms.headingPitchRollToFixedFrame(
              position,
              hpRoll,
              Cesium.Ellipsoid.WGS84,
              fixedFrameTransform
            ),
            minimumPixelSize: 128,
          })
        );

        planePrimitive.readyPromise.then(function (model) {
          // Play and loop all animations at half-speed
          model.activeAnimations.addAll({
            multiplier: 0.5,
            loop: Cesium.ModelAnimationLoop.REPEAT,
          });

          // Zoom to model
          r = 2.0 * Math.max(model.boundingSphere.radius, camera.frustum.near);
          controller.minimumZoomDistance = r * 0.5;
          Cesium.Matrix4.multiplyByPoint(
            model.modelMatrix,
            model.boundingSphere.center,
            center
          );
          const heading = Cesium.Math.toRadians(230.0);
          const pitch = Cesium.Math.toRadians(-20.0);
          hpRange.heading = heading;
          hpRange.pitch = pitch;
          hpRange.range = r * 50.0;
          camera.lookAt(center, hpRange);
        });

        document.addEventListener("keydown", function (e) {
          switch (e.keyCode) {
            case 40:
              if (e.shiftKey) {
                // speed down
                speed = Math.max(--speed, 1);
              } else {
                // pitch down
                hpRoll.pitch -= deltaRadians;
                if (hpRoll.pitch < -Cesium.Math.TWO_PI) {
                  hpRoll.pitch += Cesium.Math.TWO_PI;
                }
              }
              break;
            case 38:
              if (e.shiftKey) {
                // speed up
                speed = Math.min(++speed, 100);
              } else {
                // pitch up
                hpRoll.pitch += deltaRadians;
                if (hpRoll.pitch > Cesium.Math.TWO_PI) {
                  hpRoll.pitch -= Cesium.Math.TWO_PI;
                }
              }
              break;
            case 39:
              if (e.shiftKey) {
                // roll right
                hpRoll.roll += deltaRadians;
                if (hpRoll.roll > Cesium.Math.TWO_PI) {
                  hpRoll.roll -= Cesium.Math.TWO_PI;
                }
              } else {
                // turn right
                hpRoll.heading += deltaRadians;
                if (hpRoll.heading > Cesium.Math.TWO_PI) {
                  hpRoll.heading -= Cesium.Math.TWO_PI;
                }
              }
              break;
            case 37:
              if (e.shiftKey) {
                // roll left until
                hpRoll.roll -= deltaRadians;
                if (hpRoll.roll < 0.0) {
                  hpRoll.roll += Cesium.Math.TWO_PI;
                }
              } else {
                // turn left
                hpRoll.heading -= deltaRadians;
                if (hpRoll.heading < 0.0) {
                  hpRoll.heading += Cesium.Math.TWO_PI;
                }
              }
              break;
            default:
          }
        });

        const headingSpan = document.getElementById("heading");
        const pitchSpan = document.getElementById("pitch");
        const rollSpan = document.getElementById("roll");
        const speedSpan = document.getElementById("speed");
        const fromBehind = document.getElementById("fromBehind");

        viewer.scene.preUpdate.addEventListener(function (scene, time) {
          speedVector = Cesium.Cartesian3.multiplyByScalar(
            Cesium.Cartesian3.UNIT_X,
            speed / 10,
            speedVector
          );
          position = Cesium.Matrix4.multiplyByPoint(
            planePrimitive.modelMatrix,
            speedVector,
            position
          );
          pathPosition.addSample(Cesium.JulianDate.now(), position);
          Cesium.Transforms.headingPitchRollToFixedFrame(
            position,
            hpRoll,
            Cesium.Ellipsoid.WGS84,
            fixedFrameTransform,
            planePrimitive.modelMatrix
          );

          if (fromBehind.checked) {
            // Zoom to model
            Cesium.Matrix4.multiplyByPoint(
              planePrimitive.modelMatrix,
              planePrimitive.boundingSphere.center,
              center
            );
            hpRange.heading = hpRoll.heading;
            hpRange.pitch = hpRoll.pitch;
            camera.lookAt(center, hpRange);
          }
        });

        viewer.scene.preRender.addEventListener(function (scene, time) {
          headingSpan.innerHTML = Cesium.Math.toDegrees(hpRoll.heading).toFixed(
            1
          );
          pitchSpan.innerHTML = Cesium.Math.toDegrees(hpRoll.pitch).toFixed(1);
          rollSpan.innerHTML = Cesium.Math.toDegrees(hpRoll.roll).toFixed(1);
          speedSpan.innerHTML = speed.toFixed(1);
        });
        //Sandcastle_End
        Sandcastle.finishedLoading();
      }
      if (typeof Cesium !== "undefined") {
        window.startupCalled = true;
        startup(Cesium);
      }
    </script>
  </body>
</html>
